----- Message from evoltech@xxxxxxxxxxx ---------
Date: Thu, 10 Jan 2008 14:58:49 -0800
From: Dennison Williams <evoltech@xxxxxxxxxxx>
Reply-To: Dennison Williams <evoltech@xxxxxxxxxxx>
Subject: The effects of multiple layers of block drivers
To: linux-raid@xxxxxxxxxxxxxxx
Hello, I am starting to dig into the Block subsystem to try and uncover the reason for some data I lost recently. My situation is that I have multiple block drivers on top of each other and am wondering how the effectss of a raid 5 rebuild would affect the block devices above it. The layers are raid 5 -> lvm -> cryptoloop. It seems that after the raid 5 device was rebuilt by adding in a new disk, that the cryptoloop doesn't have a valid ext3 partition on it. As a raid device re-builds is there ant rearranging of sectors or corresponding blocks that would effect another block device on top of it? Sincerely, Dennison Williams
----- End message from evoltech@xxxxxxxxxxx -----If you add a disk and do a reshape the layer on top of the raid5 should only notice that the device is larger now. But yes, there is a rearranging of sectors going on. However this is transparent to layers on top. Did you have a disk failure during the reshape? If yes you probably have been bitten by the same bug as me: (http://marc.info/?l=linux-raid&m=119910305111460&w=2).
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